Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/2349
標題: 甲醇重組器供熱系統之實驗探討
Experimental Study of Heat Supply System for Methanol Steam Reformers
作者: 何益豪
Ho, Yei-How
關鍵字: catalyzed combustion reactor;觸媒燃燒;reformer heat supplier;catalyst support;theoretical air;Kaolinite;重組器供熱系統;觸媒載體;理論空氣量;高嶺土
出版社: 機械工程學系所
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摘要: 
本研究對重組器的供熱系統進行實驗探討,利用甲醇當作燃料,及白金為觸媒,討論燃料/空氣混合比例、燃料/空氣的流量,觸媒重量及觸媒載體等,對觸媒燃燒反應之影響。
本實驗設計之流場型式系利用CNC加工出一反應空間,將觸媒層置於流場中央,利用燃料通過觸媒層之兩面以獲得最大之反應面積。在絕熱燃燒反應中實驗結果發現,甲醇流量、空氣流量與觸媒重量皆會對燃燒產物之溫度造成影響,燃燒產物溫度隨著甲醇流量及觸媒重量的增加而上升。而空氣流量在接近理論空氣量時,燃燒產物的溫度為最高。在相同觸媒重量下,使用不同觸媒載體會對產物溫度造成影響,在實驗結果比較碳紙,不鏽鋼網及高嶺土三種不同的觸媒載體,發現高嶺土觸媒層之燃燒反應效果最好。另在無絕熱反應時,實驗結果發現,反應器本體部份則之溫升則是隨著反應器壁面厚度減少而增加。

In this study, a catalyzed combustion reactor that is to serve as the heat supplier in a methanol-steam reformer unit is designed and its performance is experimentally tested. The designed reactor is fabricated by assembling two pieces of stainless steel plates with machined cavities serving as the combustion chamber. Platinum supported by the carbon fiber paper, stainless mesh or Kaolinite is used as the catalyst layer and is sandwiched between the two steel plates. The methanol and air are used as the fuel and oxidant, respectively. The performance of the reactor is tested under various fuel/air ratios, fuel/air flow rates, catalyst weights and thermal conditions.
For the adiabatic combustion case, it was found that the temperature of product increases with the increase of catalyst weight. Based on the magnitude of the product temperature, it was found that best reactor performance can be resulted when Kaolinite was used as the catalyst support. It was also found that better reactor can be achieved as the air flow rate is approximately equal to the theoretical air.
For the un-insulated combustion case, the measured reactor wall temperature is increased as the reactor wall thickness is reduced. However, the temperature reached is not high enough to maintain the required reforming temperature which is around 260℃. Further improved design with increased catalyst weight, high reactant residence time is still needed.
URI: http://hdl.handle.net/11455/2349
其他識別: U0005-2108200917025400
Appears in Collections:機械工程學系所

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